Home | History | Annotate | Download | only in gesture 
      1 /*
      2  * Copyright (C) 2008-2009 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package android.gesture;
     18 
     19 import android.graphics.Matrix;
     20 import android.graphics.Path;
     21 
     22 /**
     23  * An oriented bounding box
     24  */
     25 public class OrientedBoundingBox {
     26     public final float squareness;
     27 
     28     public final float width;
     29     public final float height;
     30 
     31     public final float orientation;
     32 
     33     public final float centerX;
     34     public final float centerY;
     35 
     36     OrientedBoundingBox(float angle, float cx, float cy, float w, float h) {
     37         orientation = angle;
     38         width = w;
     39         height = h;
     40         centerX = cx;
     41         centerY = cy;
     42         float ratio = w / h;
     43         if (ratio > 1) {
     44             squareness = 1 / ratio;
     45         } else {
     46             squareness = ratio;
     47         }
     48     }
     49 
     50     /**
     51      * Currently used for debugging purpose only.
     52      *
     53      * @hide
     54      */
     55     public Path toPath() {
     56         Path path = new Path();
     57         float[] point = new float[2];
     58         point[0] = -width / 2;
     59         point[1] = height / 2;
     60         Matrix matrix = new Matrix();
     61         matrix.setRotate(orientation);
     62         matrix.postTranslate(centerX, centerY);
     63         matrix.mapPoints(point);
     64         path.moveTo(point[0], point[1]);
     65 
     66         point[0] = -width / 2;
     67         point[1] = -height / 2;
     68         matrix.mapPoints(point);
     69         path.lineTo(point[0], point[1]);
     70 
     71         point[0] = width / 2;
     72         point[1] = -height / 2;
     73         matrix.mapPoints(point);
     74         path.lineTo(point[0], point[1]);
     75 
     76         point[0] = width / 2;
     77         point[1] = height / 2;
     78         matrix.mapPoints(point);
     79         path.lineTo(point[0], point[1]);
     80 
     81         path.close();
     82 
     83         return path;
     84     }
     85 }
     86